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POpercentages and CSS margins
 

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    <p>I have create a jsFiddle to demonstrate my problem:</p> <blockquote> <p><a href="http://jsfiddle.net/MXt8d/1/" rel="nofollow">http://jsfiddle.net/MXt8d/1/</a></p> </blockquote> <pre><code>.outer { display: inline-block; vertical-align: top; overflow: visible; position: relative; width: 100%; height: 100%; background: red; } .inner { overflow: hidden; height: 50%; width: 100%; margin-top: 25%; margin-bottom: 25%; background: blue; opacity: 0.7; color: white; } &lt;div class="outer"&gt; &lt;div class="inner"&gt;&lt;/div&gt; &lt;/div&gt; </code></pre> <p>The thing is that when i need to horizontally center a div inside another. I specify the height of the inner div in % (eg. 50%) and then the margin-top and margin-bottom to the remaining (eg. (100 - 50) / 2 = 25 %).</p> <p>But as you see in the jsFiddle it's not working as intended.</p> <p>Calculating the margins from the Parent works, but it's not possible for me, because I dont have access to the div's parent, as the elements-style object is bound to the object via knockout.js and it's not so simple as shown in the jsFiddle.</p> <p>Hope anyone could help me :-)</p> <p>bj99</p> <p><strong>Update:</strong></p> <p>Just found out why this is actually happening, so I'll post here for peaple with similar problems:</p> <blockquote> <p>From <a href="http://www.w3.org/TR/CSS2/box.html#propdef-margin-top" rel="nofollow">http://www.w3.org/TR/CSS2/box.html#propdef-margin-top</a> :</p> <p>'margin-top', 'margin-bottom' Percentages: refer to <em><strong>width</strong></em> of containing block</p> </blockquote> <p>And not as I tought to the <strong>height</strong> :-/</p>
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